JP7465792B2 - Support mechanism for heat recovery steam generator - Google Patents

Description

The present invention relates to a support mechanism for preventing the vibration of a heat transfer tube group installed in a heat recovery steam generator.

Combined power generation plants, which have been attracting attention as a form of highly efficient power generation, first generate electricity using a gas turbine, and then recover the heat in the exhaust gas discharged from the gas turbine in a heat recovery steam generator (HRSG). The steam generated in the heat recovery steam generator is then used to drive a steam turbine to generate electricity.

In this type of waste heat recovery boiler, typically, multiple heat exchangers, such as superheaters, evaporators, and economizers, that recover heat from the exhaust gas of the gas turbine are arranged inside the casing, which is the flue for the exhaust gas. Each heat exchanger is composed of multiple heat transfer tubes aligned in the direction of exhaust gas flow, and both the top and bottom ends of each heat transfer tube are connected by upper and lower headers to form a single heat transfer tube panel. The multiple heat transfer tube panels are arranged in series inside the casing along the direction of exhaust gas flow, and each heat transfer tube panel is suspended from the upper wall surface of the casing via support beams.

Conventionally, a vibration control structure is known in which a support mechanism is provided between a heat transfer tube panel and a casing, and the horizontal load borne by this support mechanism is transmitted to the base of the casing, thereby reducing the horizontal force acting during an earthquake or the like. For example, in the vibration control structure described in Patent Document 1, the upper headers of multiple heat transfer tube panels arranged in series in the exhaust gas flow direction are connected together to an upper pedestal, and this upper pedestal is supported below the support beam of the casing by a link-type connecting metal fitting, so that the horizontal load borne by the connecting metal fitting is transmitted to the base via the support beam of the casing. In addition, the lower headers of multiple heat transfer tube panels are connected together to a lower pedestal, and this lower pedestal is supported by a support metal fitting to a reinforcing beam that rises from the lower wall surface of the casing, so that the horizontal load borne by the support metal fitting is transmitted to the base via the reinforcing beam.

Here, the upper header is connected to the upper pedestal by pinning the connector welded to the outer peripheral surface of the upper header to the upper pedestal. Similarly, the lower header is connected to the lower pedestal by pinning the connector welded to the outer peripheral surface of the lower header to the lower pedestal. In heat recovery boilers that generate steam by recovering heat from high-temperature exhaust gas, 9Cr steel is sometimes used as a header material with excellent high-temperature strength. In this case, the connectors welded to the outer peripheral surfaces of the upper and lower headers are also made of the same 9Cr steel as the header material.

JP 2009-79822 A

In recent years, the exhaust gas temperature has been rising with the increase in size and performance of gas turbines. It is predicted that the exhaust gas temperature will reach 650°C or higher, especially near the inlet of the casing, which is upstream of the exhaust gas. However, if 9Cr steel is used as the material for the connector, the allowable stress of 9Cr steel is up to 649°C, so when the exhaust gas temperature reaches 650°C or higher, the allowable tensile strength of 9Cr steel decreases, and the connector will no longer be able to support the heat transfer tube panel. If the connector is changed to a material with a higher allowable stress than 9Cr steel, such as stainless steel, it will be possible to ensure the support function even at high temperatures of 650°C or higher. However, in that case, the header welded to the connector must also be made of stainless steel, and because stainless steel is significantly more expensive than 9Cr steel, another problem arises in that costs will increase significantly.

The present invention was made in response to the current state of the prior art, and its purpose is to provide a support mechanism for a heat recovery steam generator that can handle higher temperatures while minimizing cost increases.

In order to achieve the above-mentioned object, a representative embodiment of the present invention is applied to a heat recovery boiler including a casing having a housing structure in which exhaust gas flows horizontally, a heat transfer tube group suspended inside the casing, and a header connected to an end of the heat transfer tube group, and is a support mechanism for the heat recovery boiler that suppresses vibration of the heat transfer tube group, the support mechanism comprising: a base for maintaining the position of the header in the gas flow direction; a connector welded to the header and joined to the base; a plurality of regulating members provided on the base so as to sandwich the header; and a transmission member provided between the casing and the base for transmitting a force acting on the base to the casing, the base and the connector being connected by inserting a pin into a long hole provided on one side and a round hole provided on the other side, and a first gap extending in the exhaust gas flow direction is formed between the pin and the long hole .

The support mechanism for the heat recovery boiler according to the present invention can handle higher exhaust gas temperatures while minimizing cost increases. Problems, configurations, and effects other than those described above will become clear from the description of the embodiments below.

FIG. 2 is an external perspective view of the heat recovery steam generator. FIG. 2 is a side view showing the internal structure of the heat recovery steam generator. FIG. 2 is a plan view showing an arrangement of heat exchangers arranged in a heat recovery steam generator. FIG. 13 is a side view showing the support mechanism on the upper header side. FIG. 4 is a perspective view showing a main part of a support mechanism on the upper header side. 13 is a front view showing the connecting portion between the upper header and the upper base. FIG. FIG. 4 is an explanatory diagram showing an upper connector. FIG. 13 is an explanatory diagram showing a state in which an upper elongated hole and an upper pin are joined together. FIG. 13 is a side view showing the support mechanism on the lower header side. FIG. 4 is a perspective view showing a main part of a support mechanism on the lower header side. 13 is a front view showing the connecting portion between the lower header and the lower base. FIG. FIG. 4 is an explanatory diagram showing a lower connector. FIG. 13 is an explanatory diagram showing a state in which a lower pin and a lower elongated hole are joined together.

The following describes an embodiment of the present invention with reference to Figures 1 to 13.

Figure 1 is an external perspective view of the heat recovery steam generator, Figure 2 is a side view showing the internal structure of the heat recovery steam generator, and Figure 3 is a plan view showing the arrangement of heat exchangers arranged within the heat recovery steam generator.

As shown in Figures 1 to 3, the heat recovery boiler 1 has a duct 3 through which exhaust gas 2 from a gas turbine (not shown) is guided, and the duct 3 is supported on the ground via multiple frames 4. The duct 3 has a casing 5 with a housing structure composed of upper and lower wall surfaces and left and right side wall surfaces, and multiple heat exchangers 6 such as a superheater, evaporator, and economizer, and a denitration device 7 are arranged inside the casing 5. The exhaust gas 2 discharged from the gas turbine is introduced into the inside of the casing 5 from the inlet of the duct 3, passes through the multiple heat exchangers 6 and the denitration device 7 in sequence, and is then discharged to the outside from a chimney 8. These heat exchangers 6 have multiple heat transfer tubes (heat transfer tube group) 9 extending vertically so as to intersect with the flow direction of the exhaust gas 2, and a steam separation drum 10 connected to the multiple heat transfer tubes 9 is installed on the upper outside of the casing 5.

The heat transfer tubes 9 arranged in multiple rows in the horizontal direction perpendicular to the flow direction of the exhaust gas 2 are connected to an upper header 11 at their upper ends and a lower header 12 at their lower ends, and are bundled together by a honeycomb support (not shown) to form a single heat transfer tube panel 9A. Each heat exchanger 6 is arranged in the casing 5 with multiple rows of heat transfer tube panels 9A unitized into one panel block. For example, in the heat exchanger 6 closest to the inlet of the duct 3, two rows (two panels) of heat transfer tube panels 9A arranged along the flow direction of the exhaust gas 2 are unitized into a panel block. In the second heat exchanger 6 from the inlet of the duct 3, five rows (five panels) of heat transfer tube panels 9A arranged along the flow direction of the exhaust gas 2 are unitized into a panel block.

Each heat transfer tube panel 9A is suspended from the upper wall surface of the casing 5 via a support beam 5a, and is supported in the front-to-back direction of the gas flow by a link-type connecting metal fitting 13. In this embodiment, among these heat transfer tube panels 9A, the heat transfer tube panels 9A arranged in the area where the exhaust gas temperature is 650°C or higher, i.e., the two heat transfer tube panels 9A located on the upstream end side in the flow direction of the exhaust gas 2, are supported on the support beam 5a via a support mechanism described below. This prevents the heat transfer tube panels 9A from vibrating in the front-to-back direction of the gas flow.

First, the support mechanism on the upper header side (upper support mechanism) will be described with reference to Figures 4 to 8. Figure 4 is a side view showing the support mechanism on the upper header side, Figure 5 is a perspective view showing the main parts of the support mechanism on the upper header side, Figure 6 is a front view showing the connection part between the upper header and the upper base, Figure 7 is an explanatory diagram showing the upper connector, and Figure 8 is an explanatory diagram showing the connection state of the upper long hole and the upper pin.

As described above, an upper header (header) 11 is provided at the upper end of each of the two heat transfer tube panels (heat transfer tube group 9) 9A arranged in series with respect to the flow direction of the exhaust gas 2, and an upper connector (connector) 14 is fixed to the outer circumferential surface of each upper header 11 by welding. The upper header 11 is made of general 9Cr steel, and the upper connector 14 is also made of the same material, 9Cr steel, to ensure welding strength. Each upper connector 14 is pin-connected to an upper base (base) 15, which is supported below the support beam 5a on the ceiling of the casing 5 via a link-type connecting fitting (transmission member) 13.

The upper pedestal 15 is intended to hold the position of the upper header 11 in the gas flow direction and prevent the heat transfer tube panel 9A from shaking. The upper pedestal 15 is made by butting the webs of a pair of channel steels together at a specified distance, and two upper pins 16 are installed so as to straddle both channel steels of the upper pedestal 15. In addition, a base plate 15a is fixed to the center of the upper surface of the upper pedestal 15, and the lower end of the connecting fitting 13 is connected to this base plate 15a.

As shown in FIG. 7, the upper connector 14 is made of a plate-like member with a circular arc cut at the lower end, and the plate-like member has an upper round hole 14a through which the upper pin 16 is inserted. The cut-out circular arc portion is welded to the outer peripheral surface of the upper header 11. As shown in FIG. 5, the upper base 15 has an upper long hole 15b, and with the upper pin 16 inserted through the upper long hole 15b and the upper round hole 14a, the upper part of the upper connector 14 is disposed within the gap (between the webs of a pair of channel steels) of the upper base 15 (see FIG. 6). Here, the upper long hole 15b is a non-circular hole whose major axis is the flow direction of the exhaust gas 2 (left and right direction in FIG. 8), and a first gap t1 extending in the flow direction of the exhaust gas 2 is secured between the upper pin 16 and the upper long hole 15b. The first gap t1 is the sum of the gaps t1a and t1b on both sides of the upper pin 16 (t1 = t1a + t1b), and this first gap t1 prevents the horizontal load along the flow direction of the exhaust gas 2 from acting directly on the pin connection part between the upper connector 14 and the upper base 15.

Three upper regulating members (regulating members) 17 are vertically installed at a predetermined interval on the underside of the upper base 15, and two upper headers 11 are sandwiched between these upper regulating members 17. The two upper regulating members 17 located at both ends of the upper base 15 are made of channel steel with the flanges cut diagonally, for example, and the upper regulating member 17 in the middle is made of a plate-shaped steel material. One upper header 11 is sandwiched between the flat web of the upper regulating member 17 on one end side and the upper regulating member 17 in the middle, and the other upper header 11 is sandwiched between the flat web of the upper regulating member 17 on the other end side and the upper regulating member 17 in the middle. Note that the upper regulating member 17 may have a configuration other than that described above as long as it is possible to sandwich the upper header 11. For example, it is possible to use a columnar or cylindrical steel material with a recess formed on the outer circumferential surface as the upper regulating member 17 in the middle. In addition, the upper regulating members 17 on both ends can be made of a member formed into an approximately L-shape by welding an elbow or the like to a cylindrical steel material.

Each upper regulating member 17 does not tightly sandwich the upper header 11, but the two upper regulating members 17 sandwich the upper header 11 via a second gap t2 (see FIG. 4), and the dimensional change due to thermal expansion of the upper header 11 is absorbed by the second gap t2. Note that the second gap t2 is a relatively small dimension, and the first gap t1 secured between the upper pin 16 and the upper long hole 15b is set to a value larger than the second gap t2 (t1>t2).

Next, the support mechanism on the lower header side (lower support mechanism) will be described with reference to Figures 9 to 13. Figure 9 is a side view showing the support mechanism on the lower header side, Figure 10 is a perspective view showing the main parts of the support mechanism on the lower header side, Figure 11 is a front view showing the connection part between the lower header and the lower base, Figure 12 is an explanatory diagram showing the lower connector, and Figure 13 is an explanatory diagram showing the connection state of the lower pin and the lower long hole.

Lower headers (headers) 12 are provided at the lower ends of two heat transfer tube panels (heat transfer tube groups 9) 9A arranged in series in the flow direction of the exhaust gas 2, and lower connectors (connectors) 18 are fixed to the outer periphery of each lower header 12 by welding. As with the upper header 11 and upper connector 14 described above, the material used for both the lower header 12 and the lower connector 18 is 9Cr steel.

Each lower connector 18 is pin-connected to a lower pedestal (pedestal) 19 to support the lower pedestal 19. The lower pedestal 19 is slidably engaged with a support column (transmission member) 21 provided on the lower wall (floor surface portion) of the casing 5 via a guide member 20. The support column 21 supports the horizontal force in the flow direction of the exhaust gas acting on the heat transfer tube panel 9A due to earthquakes or exhaust gas pressure.

The lower base 19 is intended to hold the position of the lower header 12 in the gas flow direction and prevent the heat transfer tube panel 9A from shaking. The lower base 19 is made up of a pair of channel steel webs butted together at a specified distance, and two lower pins 22 are installed to straddle both channel steels of the lower base 19.

Two guide members 20 made of H-shaped steel are fixed to the underside of the lower base 19, and both guide members 20 extend vertically with a predetermined distance between them. The support pillar 21 is also made of H-shaped steel and stands upward from the bottom wall of the casing 5. The support pillar 21 is inserted between the two guide members 20 so that their flanges come into contact with each other, allowing the lower base 19 to move vertically with the flanges of the guide members 20 and the support pillar 21 as sliding surfaces. In addition, ribs 23 made of triangular plate material are fixed to the four corners of the upper surface of the support pillar 21, and the vertical surfaces of each of these ribs 23 come into contact with the opposing flanges of both guide members 20. This suppresses the inclination of both guide members 20 in the vertical direction, preventing the lower base 19, which is perpendicular to both guide members 20, from inclining in the horizontal direction.

The lower connector 18 is made of a plate-like member with an upper end cut in an arc shape as shown in FIG. 12, and a lower round hole 18a is provided in this plate-like member for inserting the lower pin 22. The cut-out arc-shaped portion is welded to the outer peripheral surface of the lower header 12. As shown in FIG. 10, a lower long hole 19a is provided in the lower base 19, and with the lower pin 22 inserted through the lower long hole 19a and the lower round hole 18a, the lower part of the lower connector 18 is disposed within the above-mentioned interval of the lower base 19 (between the webs of a pair of channel steels) (see FIG. 11). Here, as shown in FIG. 13, the lower long hole 19a is a non-circular hole with the major axis in the vertical direction, and a fifth gap S extending along the vertical direction is secured between the lower pin 22 and the lower long hole 19a, so that the fifth gap S allows for the difference in the amount of expansion (expansion difference) of the individual heat transfer tube panels 9A downward due to heating of the heat transfer tube group 9.

Three lower regulating members (regulating members) 24 are vertically attached at a predetermined interval on the upper surface of the lower base 19, and two lower headers 12 are sandwiched between these lower regulating members 24. As with the upper regulating member 17 described above, the two lower regulating members 24 located at both ends of the lower connector 18 are made of channel steel with diagonally cut flanges, and the lower regulating member 24 in the middle is made of plate-shaped steel. Of course, the shape of the lower regulating member 24 is not limited to this. One lower header 12 is sandwiched between the flat web of the lower regulating member 24 on one end side and the lower regulating member 24 in the middle, and the other lower header 12 is sandwiched between the flat web of the lower regulating member 24 on the other end side and the lower regulating member 24 in the middle.

In addition, each lower regulating member 24 does not tightly sandwich the lower header 12. Instead, the two lower regulating members 24 sandwich the lower header 12 via a fourth gap t4 (see FIG. 9). This allows the dimensional change caused by thermal expansion of the lower header 12 to be absorbed by the fourth gap t4.

As shown in FIG. 13, a third gap t3 (t3=t3a+t3b) is provided between the lower pin 22 and the lower long hole 19a in the flow direction of the exhaust gas 2 (left-right direction in the figure). This third gap t3 is set to a value larger than the fourth gap t4 (t3>t4), similar to the support mechanism on the upper header side. The third gap t3 may be the same as the first gap t1 described above, or may be a different value. The fourth gap t4 may be the same as the second gap t2 described above, or may be a different value.

As described above, in the support mechanism of the heat recovery boiler 1 according to this embodiment, the upper connector 14 welded to the upper header 11 is pin-connected to the upper pedestal 15 supported on the upper wall surface side of the casing 5 via the connecting metal fittings 13, and the upper regulating member 17 is provided to sandwich the upper header 11. Therefore, the horizontal force in the front-rear direction of the gas flow acting on the upper header 11 during an earthquake or the like is not transmitted to the joint between the upper header 11 and the upper connector 14, but is borne by the upper regulating member 17 and the upper pedestal 15 and transmitted to the foundation via the connecting metal fittings 13, the support beam 5a, and the frame 4. In other words, the horizontal force generated during an earthquake or the like does not act on the upper connector 14. Therefore, even though 9Cr steel is used as the material for the upper header 11 and the upper connector 14, the vibration of the heat transfer tube panel 9A can be suppressed even under high temperature conditions of the exhaust gas 2 exceeding 650°C. In other words, the support function of the heat transfer tube panel 9A can be secured.

In addition, in the support mechanism of the heat recovery boiler 1 according to this embodiment, the lower connector 18 welded to the lower header 12 is pin-connected to the lower pedestal 19, and the lower regulating member 24 that sandwiches the lower header 12 is provided on the lower pedestal 19. Therefore, the horizontal force of the gas flow in the front-rear direction acting on the lower header 12 during an earthquake or the like is borne by the lower regulating member 24 and the lower pedestal 19, and is transmitted to the foundation via the support column 21, the support beam 5a, and the frame 4. That is, the horizontal force of the gas flow in the front-rear direction generated during an earthquake or the like is supported by the support column 21 and does not act on the lower connector 18. Therefore, as with the upper support mechanism, even though 9Cr steel is used as the material for the lower header 12 and the lower connector 18, the vibration of the heat transfer tube panel 9A can be suppressed even under high temperature conditions of the exhaust gas 2. That is, the support function of the heat transfer tube panel 9A can be more reliably secured.

In addition, in the support mechanism for the heat recovery boiler 1 according to this embodiment, the upper pedestal 15 and the upper connector 14 are pin-connected by inserting the upper pin 16 through the upper long hole 15b in the upper pedestal 15 and the upper round hole 14a in the upper connector 14, and a first gap t1 extending in the flow direction of the exhaust gas 2 is secured between the upper pin 16 and the upper long hole 15b. Therefore, the horizontal load along the flow direction of the exhaust gas 2 is absorbed by the upper pin 16 moving within the upper long hole 15b, and the horizontal load can be prevented from acting directly on the pin connection portion between the upper connector 14 and the upper pedestal 15.

Similarly, the lower base 19 and the lower connector 18 are pin-connected by inserting the lower pin 22 through the lower long hole 19a in the lower base 19 and the lower round hole 18a in the lower connector 18, and a third gap t3 extending in the flow direction of the exhaust gas 2 is secured between the lower pin 22 and the lower long hole 19a. Therefore, the horizontal load along the flow direction of the exhaust gas 2 is absorbed by the lower pin 22 moving within the lower long hole 19a, and the horizontal load can be prevented from acting directly on the pin connection portion between the lower connector 18 and the lower base 19.

In addition, in the support mechanism for the heat recovery boiler 1 according to this embodiment, the upper regulating member 17 sandwiches the upper header 11 through the second gap t2, and similarly, the lower regulating member 24 sandwiches the lower header 12 through the fourth gap t4, so that the dimensional changes due to thermal expansion of the upper header 11 and the lower header 12 can be absorbed by the second gap t2 and the fourth gap t4, respectively.

In addition, in the support mechanism of the exhaust heat recovery boiler 1 according to this embodiment, the lower pedestal 19 and the lower connector 18 are pin-connected by inserting the lower pin 22 through the lower long hole 19a in the lower pedestal 19 and the lower round hole 18a in the lower connector 18, and a fifth gap S extending vertically is secured between the lower pin 22 and the lower long hole 19a. Therefore, the fifth gap S can allow the difference in downward expansion caused by heating of the heat transfer tube group 9. Furthermore, a pair of guide members 20 fixed to the lower pedestal 19 are slidably supported by support columns 21 standing from the bottom wall of the casing 5, and a rib 23 that contacts the sliding surface of the guide member 20 is fixed to the upper surface of the support column 21, so that the inclination of the lower pedestal 19 that supports the horizontal force in the gas flow direction of the lower header 12 can be reliably prevented.

The present invention is not limited to the above-described embodiment, but includes various modifications. The above-described embodiment has been described in detail to clearly explain the present invention, and is not necessarily limited to having all of the configurations described.

For example, in the above embodiment, the support mechanism according to the present invention is applied to two rows of heat transfer tube panels 9A located at the upstream end side in the flow direction of the exhaust gas 2, but a similar support mechanism may be applied to other heat transfer tube panels 9A. Furthermore, the number of upper headers 11 sandwiched between the upper regulating member 17 on the upper base 15 side and the number of lower headers 12 sandwiched between the lower regulating member 24 on the lower base 19 side are not limited to two, and may be one row or three or more rows of heat transfer tube panels 9A.

In addition, in the above embodiment, since 9Cr steel is used as the material for the upper header 11 and the lower header 12, 9Cr steel is also used as the material for the upper connector 14 and the lower connector 18 welded to them. However, it is also possible to use steel materials other than 9Cr steel as the material for the upper connector 14 and the lower connector 18 as long as they are made of the same type of material as the upper header 11 and the lower header 12.

The support mechanism according to the present invention can be applied only to the upper header 11 or only to the lower header 12.

Reference Signs List 1 Waste heat recovery boiler 2 Exhaust gas 3 Duct 4 Frame 5 Casing 5a Support beam 6 Heat exchanger 7 Denitrification device 8 Chimney 9 Heat transfer tube (heat transfer tube group)
9A Heat transfer tube panel 10 Steam separation drum 11 Upper header (header)
12 Lower Header (Header)
13 Connecting fitting (transmission member)
14 Upper connector (connector)
14a Upper round hole (round hole)
15 Upper pedestal (pedestal)
15a Base plate 15b Upper slot (slot)
16 Upper pin (pin)
17 Upper regulating member (regulating member)
18 Lower connector (connector)
18a Lower round hole (round hole)
19 Lower pedestal (pedestal)
19a Lower slot (slot)
20 Guide member 21 Support column (transmission member)
22 Lower pin (pin)
23 Rib 24 Lower regulating member (regulating member)
t1 First gap t2 Second gap t3 Third gap t4 Fourth gap S Fifth gap

Claims (6)

A support mechanism for a heat recovery boiler including a casing having a housing structure in which exhaust gas flows horizontally, a heat transfer tube group suspended inside the casing, and a header connected to an end of the heat transfer tube group, the support mechanism suppressing vibration of the heat transfer tube group, comprising:
a base for holding the position of the header in a gas flow direction;
a connector welded to the header and coupled to the base;
a plurality of restricting members provided on the base so as to sandwich the header;
a transmission member provided between the casing and the base, the transmission member transmitting a force acting on the base to the casing;
Equipped with
A support mechanism for a waste heat recovery boiler, characterized in that the base and the connector are connected by inserting a pin into a long hole provided on one side and a round hole provided on the other side, and a first gap extending in the flow direction of the exhaust gas is formed between the pin and the long hole . 2. The support mechanism for a heat recovery steam generator according to claim 1 ,
A support mechanism for a heat recovery boiler, characterized in that the multiple regulating members sandwich the header via a second gap, and the first gap is set larger than the second gap. A support mechanism for a heat recovery boiler that is applied to the heat recovery boiler and includes: a casing having a housing structure in which exhaust gas flows horizontally; a heat transfer tube group suspended inside the casing; an upper header connected to an upper end of the heat transfer tube group and extending in a horizontal direction perpendicular to the flow of the exhaust gas; and a lower header connected to a lower end of the heat transfer tube group and extending in a horizontal direction perpendicular to the flow of the exhaust gas, the support mechanism comprising:
the support mechanism for the exhaust heat recovery boiler includes an upper support mechanism that suppresses vibration of an upper end portion of the heat transfer tube group and a lower support mechanism that suppresses vibration of a lower end portion of the heat transfer tube group,
the upper support mechanism comprises an upper pedestal for holding a position of the upper header in a gas flow direction, an upper connector welded to the upper header and joined to the upper pedestal, a plurality of upper regulating members provided on the upper pedestal so as to sandwich the upper header, and a connecting metal fitting provided on a ceiling portion of the casing and connected to the upper pedestal,
the lower support mechanism comprises a lower pedestal for holding a position of the lower header in a gas flow direction, a lower connector welded to the lower header and joined to the lower pedestal, a plurality of lower regulating members provided on the lower pedestal so as to sandwich the lower header, and a support column provided on a floor portion of the casing for supporting a horizontal force acting on the lower pedestal ,
the upper base and the upper connector are connected to each other by inserting an upper pin into an upper long hole provided on one side and an upper round hole provided on the other side, and a first gap extending in a flow direction of exhaust gas is formed between the upper pin and the upper long hole,
A support mechanism for a waste heat recovery boiler, characterized in that the lower base and the lower connector are connected by inserting a lower pin into a lower long hole provided on one side and a lower round hole provided on the other side, and a third gap extending in the flow direction of the exhaust gas is formed between the lower pin and the lower long hole . The support mechanism for a heat recovery steam generator according to claim 3 ,
the upper header is sandwiched between the upper regulating members via a second gap, and the first gap is set larger than the second gap;
A support mechanism for a waste heat recovery boiler, characterized in that the multiple lower regulating members sandwich the lower header via a fourth gap, and the third gap is set larger than the fourth gap. The support mechanism for a heat recovery steam generator according to claim 3 or 4 ,
a fifth gap extending along a vertical direction is formed between the lower pin and the lower long hole. The support mechanism for a heat recovery steam generator according to any one of claims 3 to 5 ,
A support mechanism for a heat recovery boiler, characterized in that the lower base is engaged with the support column so as to be slidable in the vertical direction, and a rib is provided on the upper surface of the support column to prevent the lower base from tilting.

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